Linked from
The 23 pages that link to Wiener process, each with the reason it gives.
RandomnessBroader topic: It is a precise mathematical model for continuously varying random motion.
MartingaleBroader topic: Standard Brownian motion is a canonical continuous-time martingale.
White noiseBroader topic: Its formal derivative is idealized as continuous-time white noise.
Paul LévyRelated: Lévy’s work clarified its paths and its place among stochastic processes.
Itô's lemmaRelated: It provided the rigorous process setting for Itô's foundational results.